339 lines
11 KiB
C++
339 lines
11 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "media/base/rtp_data_engine.h"
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#include <map>
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#include "absl/strings/match.h"
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#include "media/base/codec.h"
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#include "media/base/media_constants.h"
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#include "media/base/rtp_utils.h"
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#include "media/base/stream_params.h"
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#include "rtc_base/copy_on_write_buffer.h"
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#include "rtc_base/data_rate_limiter.h"
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#include "rtc_base/helpers.h"
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#include "rtc_base/logging.h"
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#include "rtc_base/sanitizer.h"
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namespace cricket {
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// We want to avoid IP fragmentation.
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static const size_t kDataMaxRtpPacketLen = 1200U;
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// We reserve space after the RTP header for future wiggle room.
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static const unsigned char kReservedSpace[] = {0x00, 0x00, 0x00, 0x00};
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// Amount of overhead SRTP may take. We need to leave room in the
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// buffer for it, otherwise SRTP will fail later. If SRTP ever uses
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// more than this, we need to increase this number.
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static const size_t kMaxSrtpHmacOverhead = 16;
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RtpDataEngine::RtpDataEngine() {
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data_codecs_.push_back(
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DataCodec(kGoogleRtpDataCodecPlType, kGoogleRtpDataCodecName));
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}
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DataMediaChannel* RtpDataEngine::CreateChannel(const MediaConfig& config) {
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return new RtpDataMediaChannel(config);
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}
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static const DataCodec* FindCodecByName(const std::vector<DataCodec>& codecs,
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const std::string& name) {
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for (const DataCodec& codec : codecs) {
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if (absl::EqualsIgnoreCase(name, codec.name))
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return &codec;
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}
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return nullptr;
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}
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RtpDataMediaChannel::RtpDataMediaChannel(const MediaConfig& config)
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: DataMediaChannel(config) {
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Construct();
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SetPreferredDscp(rtc::DSCP_AF41);
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}
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void RtpDataMediaChannel::Construct() {
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sending_ = false;
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receiving_ = false;
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send_limiter_.reset(new rtc::DataRateLimiter(kDataMaxBandwidth / 8, 1.0));
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}
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RtpDataMediaChannel::~RtpDataMediaChannel() {
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std::map<uint32_t, RtpClock*>::const_iterator iter;
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for (iter = rtp_clock_by_send_ssrc_.begin();
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iter != rtp_clock_by_send_ssrc_.end(); ++iter) {
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delete iter->second;
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}
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}
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void RTC_NO_SANITIZE("float-cast-overflow") // bugs.webrtc.org/8204
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RtpClock::Tick(double now, int* seq_num, uint32_t* timestamp) {
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*seq_num = ++last_seq_num_;
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*timestamp = timestamp_offset_ + static_cast<uint32_t>(now * clockrate_);
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// UBSan: 5.92374e+10 is outside the range of representable values of type
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// 'unsigned int'
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}
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const DataCodec* FindUnknownCodec(const std::vector<DataCodec>& codecs) {
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DataCodec data_codec(kGoogleRtpDataCodecPlType, kGoogleRtpDataCodecName);
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std::vector<DataCodec>::const_iterator iter;
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for (iter = codecs.begin(); iter != codecs.end(); ++iter) {
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if (!iter->Matches(data_codec)) {
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return &(*iter);
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}
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}
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return NULL;
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}
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const DataCodec* FindKnownCodec(const std::vector<DataCodec>& codecs) {
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DataCodec data_codec(kGoogleRtpDataCodecPlType, kGoogleRtpDataCodecName);
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std::vector<DataCodec>::const_iterator iter;
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for (iter = codecs.begin(); iter != codecs.end(); ++iter) {
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if (iter->Matches(data_codec)) {
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return &(*iter);
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}
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}
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return NULL;
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}
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bool RtpDataMediaChannel::SetRecvCodecs(const std::vector<DataCodec>& codecs) {
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const DataCodec* unknown_codec = FindUnknownCodec(codecs);
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if (unknown_codec) {
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RTC_LOG(LS_WARNING) << "Failed to SetRecvCodecs because of unknown codec: "
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<< unknown_codec->ToString();
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return false;
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}
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recv_codecs_ = codecs;
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return true;
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}
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bool RtpDataMediaChannel::SetSendCodecs(const std::vector<DataCodec>& codecs) {
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const DataCodec* known_codec = FindKnownCodec(codecs);
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if (!known_codec) {
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RTC_LOG(LS_WARNING)
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<< "Failed to SetSendCodecs because there is no known codec.";
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return false;
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}
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send_codecs_ = codecs;
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return true;
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}
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bool RtpDataMediaChannel::SetSendParameters(const DataSendParameters& params) {
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return (SetSendCodecs(params.codecs) &&
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SetMaxSendBandwidth(params.max_bandwidth_bps));
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}
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bool RtpDataMediaChannel::SetRecvParameters(const DataRecvParameters& params) {
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return SetRecvCodecs(params.codecs);
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}
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bool RtpDataMediaChannel::AddSendStream(const StreamParams& stream) {
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if (!stream.has_ssrcs()) {
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return false;
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}
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if (GetStreamBySsrc(send_streams_, stream.first_ssrc())) {
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RTC_LOG(LS_WARNING) << "Not adding data send stream '" << stream.id
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<< "' with ssrc=" << stream.first_ssrc()
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<< " because stream already exists.";
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return false;
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}
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send_streams_.push_back(stream);
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// TODO(pthatcher): This should be per-stream, not per-ssrc.
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// And we should probably allow more than one per stream.
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rtp_clock_by_send_ssrc_[stream.first_ssrc()] =
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new RtpClock(kDataCodecClockrate, rtc::CreateRandomNonZeroId(),
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rtc::CreateRandomNonZeroId());
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RTC_LOG(LS_INFO) << "Added data send stream '" << stream.id
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<< "' with ssrc=" << stream.first_ssrc();
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return true;
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}
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bool RtpDataMediaChannel::RemoveSendStream(uint32_t ssrc) {
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if (!GetStreamBySsrc(send_streams_, ssrc)) {
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return false;
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}
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RemoveStreamBySsrc(&send_streams_, ssrc);
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delete rtp_clock_by_send_ssrc_[ssrc];
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rtp_clock_by_send_ssrc_.erase(ssrc);
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return true;
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}
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bool RtpDataMediaChannel::AddRecvStream(const StreamParams& stream) {
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if (!stream.has_ssrcs()) {
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return false;
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}
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if (GetStreamBySsrc(recv_streams_, stream.first_ssrc())) {
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RTC_LOG(LS_WARNING) << "Not adding data recv stream '" << stream.id
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<< "' with ssrc=" << stream.first_ssrc()
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<< " because stream already exists.";
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return false;
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}
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recv_streams_.push_back(stream);
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RTC_LOG(LS_INFO) << "Added data recv stream '" << stream.id
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<< "' with ssrc=" << stream.first_ssrc();
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return true;
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}
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bool RtpDataMediaChannel::RemoveRecvStream(uint32_t ssrc) {
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RemoveStreamBySsrc(&recv_streams_, ssrc);
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return true;
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}
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// Not implemented.
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void RtpDataMediaChannel::ResetUnsignaledRecvStream() {}
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void RtpDataMediaChannel::OnPacketReceived(rtc::CopyOnWriteBuffer packet,
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int64_t /* packet_time_us */) {
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RtpHeader header;
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if (!GetRtpHeader(packet.cdata(), packet.size(), &header)) {
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return;
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}
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size_t header_length;
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if (!GetRtpHeaderLen(packet.cdata(), packet.size(), &header_length)) {
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return;
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}
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const char* data =
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packet.cdata<char>() + header_length + sizeof(kReservedSpace);
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size_t data_len = packet.size() - header_length - sizeof(kReservedSpace);
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if (!receiving_) {
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RTC_LOG(LS_WARNING) << "Not receiving packet " << header.ssrc << ":"
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<< header.seq_num << " before SetReceive(true) called.";
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return;
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}
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if (!FindCodecById(recv_codecs_, header.payload_type)) {
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return;
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}
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if (!GetStreamBySsrc(recv_streams_, header.ssrc)) {
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RTC_LOG(LS_WARNING) << "Received packet for unknown ssrc: " << header.ssrc;
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return;
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}
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// Uncomment this for easy debugging.
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// const auto* found_stream = GetStreamBySsrc(recv_streams_, header.ssrc);
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// RTC_LOG(LS_INFO) << "Received packet"
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// << " groupid=" << found_stream.groupid
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// << ", ssrc=" << header.ssrc
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// << ", seqnum=" << header.seq_num
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// << ", timestamp=" << header.timestamp
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// << ", len=" << data_len;
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ReceiveDataParams params;
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params.ssrc = header.ssrc;
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params.seq_num = header.seq_num;
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params.timestamp = header.timestamp;
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SignalDataReceived(params, data, data_len);
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}
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bool RtpDataMediaChannel::SetMaxSendBandwidth(int bps) {
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if (bps <= 0) {
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bps = kDataMaxBandwidth;
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}
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send_limiter_.reset(new rtc::DataRateLimiter(bps / 8, 1.0));
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RTC_LOG(LS_INFO) << "RtpDataMediaChannel::SetSendBandwidth to " << bps
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<< "bps.";
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return true;
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}
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bool RtpDataMediaChannel::SendData(const SendDataParams& params,
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const rtc::CopyOnWriteBuffer& payload,
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SendDataResult* result) {
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if (result) {
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// If we return true, we'll set this to SDR_SUCCESS.
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*result = SDR_ERROR;
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}
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if (!sending_) {
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RTC_LOG(LS_WARNING) << "Not sending packet with ssrc=" << params.ssrc
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<< " len=" << payload.size()
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<< " before SetSend(true).";
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return false;
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}
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if (params.type != cricket::DMT_TEXT) {
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RTC_LOG(LS_WARNING)
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<< "Not sending data because binary type is unsupported.";
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return false;
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}
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const StreamParams* found_stream =
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GetStreamBySsrc(send_streams_, params.ssrc);
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if (!found_stream) {
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RTC_LOG(LS_WARNING) << "Not sending data because ssrc is unknown: "
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<< params.ssrc;
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return false;
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}
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const DataCodec* found_codec =
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FindCodecByName(send_codecs_, kGoogleRtpDataCodecName);
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if (!found_codec) {
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RTC_LOG(LS_WARNING) << "Not sending data because codec is unknown: "
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<< kGoogleRtpDataCodecName;
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return false;
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}
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size_t packet_len = (kMinRtpPacketLen + sizeof(kReservedSpace) +
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payload.size() + kMaxSrtpHmacOverhead);
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if (packet_len > kDataMaxRtpPacketLen) {
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return false;
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}
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double now =
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rtc::TimeMicros() / static_cast<double>(rtc::kNumMicrosecsPerSec);
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if (!send_limiter_->CanUse(packet_len, now)) {
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RTC_LOG(LS_VERBOSE) << "Dropped data packet of len=" << packet_len
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<< "; already sent " << send_limiter_->used_in_period()
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<< "/" << send_limiter_->max_per_period();
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return false;
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}
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RtpHeader header;
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header.payload_type = found_codec->id;
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header.ssrc = params.ssrc;
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rtp_clock_by_send_ssrc_[header.ssrc]->Tick(now, &header.seq_num,
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&header.timestamp);
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rtc::CopyOnWriteBuffer packet(kMinRtpPacketLen, packet_len);
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if (!SetRtpHeader(packet.data(), packet.size(), header)) {
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return false;
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}
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packet.AppendData(kReservedSpace);
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packet.AppendData(payload);
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RTC_LOG(LS_VERBOSE) << "Sent RTP data packet: "
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" stream="
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<< found_stream->id << " ssrc=" << header.ssrc
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<< ", seqnum=" << header.seq_num
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<< ", timestamp=" << header.timestamp
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<< ", len=" << payload.size();
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rtc::PacketOptions options;
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options.info_signaled_after_sent.packet_type = rtc::PacketType::kData;
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MediaChannel::SendPacket(&packet, options);
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send_limiter_->Use(packet_len, now);
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if (result) {
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*result = SDR_SUCCESS;
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}
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return true;
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}
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} // namespace cricket
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